Interface Style

A collection of attributes to associate with an element in a document.
Since these are typically used to associate character and paragraph
styles with the element, operations for this are provided. Other
customized attributes that get associated with the element will
effectively be name-value pairs that live in a hierarchy and if a name
(key) is not found locally, the request is forwarded to the parent.
Commonly used attributes are separated out to facilitate alternative
implementations that are more efficient.